This book brings together material essential for the understanding and application of techniques used in relation to water wells. Adopting a practical approach, emphasis is put on field-based trials and effective implementation. The basic concepts of hydrogeology are presented, explaining the fundamentals of subsurface hydraulics. This is supplemented by the main exploration methods used in hydrogeology, the criteria for developing groundwater resources and the main principles of water chemistry. A detailed description of the various drilling techniques is given, and each stage in the design and construction of water wells is set out. Numerous practical examples are included. Database management tools providing techniques for the monitoring and storing of information are described.